S&S Cycle 84-91 BT w/ Stock Bore Super Stock Alternator Style Crankcase -Natural

If you're working on a 1984-'91 Big Twin Harley-Davidson, this S&S Cycle Super Stock Alternator Style Crankcase is a solid foundation for your engine build. Whether you're aiming for a stock replacement or a high-performance machine, these crankcases offer some notable features that make them a great choice. They are compatible with a wide range of stock components, including flywheel assemblies, primary covers, and gearcovers, simplifying the build process.

What sets these crankcases apart is their machining for a crank position sensor, which is essential for modern EFI systems and allows for easy integration with S&S ignition and fuel injection setups. The design also includes a ported breather passageway and a machined breather window to ensure unrestricted airflow from the flywheel cavity to the cam chest. For engines larger than 95 cubic inches, S&S recommends using both crankcase breathers for optimal venting. Additionally, the relocated cam chest oil pick-up is designed to improve gear case scavenging and minimize oil carry-over at high speeds, while the cases are clearanced for strokes up to 5 inches, giving you flexibility for performance builds.

These crankcases are also machined to accept the stock oil filter assembly used on 1984-'91 big twins and are clearanced for 38 amp alternator stators. This attention to detail means they fit right with many original parts, making them a popular option for builders looking for a reliable and capable crankcase for their project.